THE SKELETON AND TEETH 133 4. The lachrymal bone is squarer. 5. The pterygoid fossae are deeper. 6. The sphenoidal air sinuses are more restricted. The skull oftlie. Gorilla differs frum that *tf Mati hi thf following respects :— 1. The cranial part is relatively smaller and the facial part relatively larger. 2. There are sagittal and lambdoid cristae. 3. The supra-orbital crests are large and confluent. 4. The lachrymo-ethmoidal junction is small. 5. The nasal bones are longer and anchylosed. 6. The prernaxillse are larger, and part of the maxillo- prernaxillary suture persists. 7. The zygoma is stronger and relatively shorter. 8. The infra-temporal crest is reduced. 9. The alisphenoid does not meet the parietal in the pterion. 10. The external auditory rueatus is smaller. 11. The supra-occipital is broader and lower. 12. The foramen magnum is larger, more oblique and farther back. 13. The occipital condyles are relatively smaller. 14. The basi-occipital is longer, and the suture between it and the basi-sphenoid persists, 15. The glenoid fossa is shallower and the post-glenoid processes are larger. 16. The inastoid and vaginal processes are smaller, and the styloid process is also smaller when present. 17. The ramus of the mandible is longer and the sym- physis slopes backwards. 18. The vitreous table of the skull is better defined in some places. 19. The sphenoidal air-sinuses and antrurn of Highmore are larger. 20. The olfactory fossa of the skull is larger, but the crista galli is rudimentary or absent. 21. The middle- and posterior fossae of the skull are smaller. 22. The sella turcica and posterior clinoid processes are small or absent.